Billings, Montana | William Billings | Billings Metropolitan Area | Billings | Joel Billings | Josh Billings | Gloria Ladson-Billings | Elkanah Billings | Noyes Billings | Lewis Billings | John Shaw Billings | Frederick H. Billings | Franklin S. Billings, Jr. | Braddish Billings | Billings Logan International Airport | Alfred Billings Street |
O'Gorman is particularly known for his research and writing on the nineteenth-century American architects Henry Hobson Richardson, Frank Furness, and Hammatt Billings.